You do about 500 hours or more of OMM lab. Hiring 500 hours worth of help at 10 dollars an hour, in addition to at least 100 hours of training per standardized patient, times 175 students... you're looking at a total cost of $1,175,000 if you can even find enough people who want the job. That's $6,500 you'd be adding to each student's tuition just so they wouldn't have to suffer the indignity of having to touch one another
OMM lab isn't a sexual thing. Being touched by other people isn't sexual- it's pretty damn immature to feel otherwise. If you're just insecure or have religious beliefs or whatever, that's one thing, but to believe that a person touching another person of the sex they happen to be attracted to is a sexual interaction is just childish.
You may believe professionalism to just be some buzz word you aren't actually expected to exemplify, but get used to the idea that med school is less like school and more like the workplace. You go when and where they tell you to go, dress how they tell you to dress (I've had to go from professional (practice conference) to scrubs (anatomy) to OMM gear all in one day), and do as they tell you to do (objectives, projects, etc) if you want to survive. You're expected to represent the profession to your community through involvement, the school through research, etc. As an example, let's say you went to the bar wearing a COM hoodie. Undergrad, that's acceptable. Get caught doing it here and you're visiting the dean. Use unprofessional language in a CSA because you got nervous and just weren't thinking? Welcome to automatic remediation. Things like that. If you can't deal with constantly being forced to fit the professional mold (or actually just have a modicum of professionalism to begin with because you've had a professional career beforehand), med school isn't for you.